Department of Chemical Engineering, National Institute of Technology Calicut, Calicut, 673 601, India.
Environ Res. 2022 Jul;210:112924. doi: 10.1016/j.envres.2022.112924. Epub 2022 Feb 8.
In this study, we report the combined effect of graphene oxide (GO) and polyvinylpyrrolidone (PVP) for the heavy metal removal efficiency of polyethersulfone (PES) membranes. PVP with four different amounts of GO was infused in the membrane matrix by the physical blending method. Characterizations such as porosity, contact angle, water flux and Fourier transform infrared spectroscopy were conducted for all prepared membranes. Viscid behavior of polymer dope solution was examined to understand the phase separation phenomena better. PVP enhanced the GO distribution within the membrane surface to some extent via hydrogen bond. The addition of nanoparticles enhanced the membrane physicochemical properties with water permeation, Pb rejection and adsorption capacity. Permeate flux of modified membrane (m4) was found to be 150.21 L/mh and it is 8.03 times higher than unmodified membrane (m0). Besides, all fabricated membranes were evaluated for Pb rejection from synthetic wastewater and rejection % of m4 (80.6%) had increased twofold than m0 (38.9%). Membrane cleaning was performed using different methods and the best results were achieved with a concentration of 0.05 wt% sodium hypochlorite under pH 7 and further reused for the filtration test. Moreover, adsorption isotherm was tested using Freundlich and Langmuir models and the Langmuir model offered the best fitting.
在这项研究中，我们报告了氧化石墨烯（GO）和聚乙烯吡咯烷酮（PVP）对聚醚砜（PES）膜重金属去除效率的协同作用。通过物理共混法将具有四种不同 GO 含量的 PVP 注入到膜基质中。对所有制备的膜进行了孔隙率、接触角、水通量和傅里叶变换红外光谱等特性的表征。通过研究聚合物铸膜液的粘性行为，更好地理解相分离现象。PVP 通过氢键在一定程度上增强了 GO 在膜表面的分布。纳米粒子的添加提高了膜的物理化学性能，增加了水渗透、Pb 截留和吸附能力。改性膜（m4）的渗透通量为 150.21 L/mh，比未改性膜（m0）高 8.03 倍。此外，所有制备的膜都用于从合成废水中去除 Pb，m4（80.6%）的截留率比 m0（38.9%）提高了一倍。采用不同的方法对膜进行清洗，在 pH 值为 7 时，使用 0.05 wt%次氯酸钠的效果最佳，并进一步重复用于过滤测试。此外，还使用 Freundlich 和 Langmuir 模型对吸附等温线进行了测试，Langmuir 模型提供了最佳拟合。
